Apparatus for concentrating solutions by freezing



my m, 1925.

E. MONTI APPARATUS FOR CONCENTRATING SOLUTIONS BY FREEZING Filed May 27, 1921 PATENT. OFFICE..

l EUDO MONTI, 0F ST: LOUIS, MISSOURI.

APPARATUS FOB CQNCENTBATING SGLUTIONS BY FREEZING.

.Application led Maya?, 1921; Serial No. 473,086.A

To all whom t may concern: 4

Be it known-that I, Enno MONTI, a subject of theKingof Italy, and a resident of St.

' Louis, inthe county of St. Louis, State of Missouri, have invented certain new and useful Improvements 1n an Apparatusfor Concentrating Solutions by Freezing, of which March 28, 1919, Serial No. 285,907of'w`hich l the following isaspeciiication. l The invention relates to thev direct expansion revolving freezer described in my U. S. Patent No. 1,065,829. ,Reference is also made to my coendin applications filed October 3, 1916, erial o. 123,563 and the kpresent application is a continuation in part. I

The Aobject of the present inventionis to improve the constructionof certain parts of the apparatus whereby its efficiency will be enhanced and continuous operation will be made possible.

vReferring to the accompanying drawings,

I in which an illustrative embodiment of my invention is shown:

Fig. lis a plan view, v

Fig. 2 is 'a' vertical longitudinal sectional view of my improved apparatus, and y Fig. 8 is a vertical transverse sectional view of the same. s

A pair of freezing drums 1. 2 are rotatably mounted in suitable bearings 3-3 4-4 on the ends walls 5-6 of the shallow tank 7 The trunnions 8--9 of the drums are hollow and are connected'in pairs by pipes 10-11'. By means of a supplly pi e from arefrigeratin machine (not s own liqui'd ammonia or ot er refriglerant is sup lied to the drums yby way .of t e pipe 10 an trunnions 8, evaporating as it enters the drums to produce the desired refrigerating .Y eiect and the vapor being drawn, off and returned to the compressor at the` opposite ends of the drums through the trunnions 9 and pipe 11.

Ex ansion valves 12 1'3 are provided at convement points for controlling the supply of refrigerant and regulating the pressure `within the drums.

A pair of longitudinal partitions' 14 .secured to the end walls 5-6 and convergm downwardly, form an o n bottomed troug between the drums. wo oppositely 'presented series of scrapers 15 16 are supported adiacent their vouter ends by the partitions 14 and at their inner ends b brackets 17 which are secured to' a centra 'longitudinal grder 18.

The Scrapers consist of wooden blades having rearwardly projecting stems v19 vwhich project loosely through holes in the brackets 17. By means of springs 20 the Scrapers 16 are held in yielding contact with the drums. It is an important feature of my invention that the Scrapers 15 are pre# sented `to the drums in substantially radial planes, this arrangement being far'superior to the tangential disposition of the scrapers shown in my Patent No. 1,065,829. .l

It will be observed that the forward edge `of the scrapers form an -unbroken line ot.

scraping contact with the drums from end to end. But rearwardly the width of the.

`scrapers is reduced by employing the stems 19 and cutting `away the corners of the l wooden blades, thus providing openings between the blades throngh which vthe mushy sherbet scraped from the drums may fall into the trough formed by the partitions 14. 'Adj acent the bottom of the trough I provide a screen v21 in the form of an endless rforatedbelt of'any suitable material. is screen-6r belt 21 is supported on drums 22 23, which latter may be driven so as to impart longitudinal movement to the screen whereby it conveys away from the drums the mushy sherbet scraped therefrom, permitting a portion ofthe liquid vsyrup to fall into the tank 7.` Any suitable means for receiving the snow-like ice crystals from the screen may be provided as-for example, a tank 24 situated beneath ,the drum 22. Further treatment vof the pul y mass deposited inthe tank 24 is su ciently def scribed in my prior patents (see No. 761,387) and forms no part of the present invention.

The operation of the apparatusis briefly as follows. reference being made to my prior patents for a detailed description of the process of concentrating solutionsvby freezing-.carried on byV means of the apparatus:

7 to a depth suicient to immerse the drums a few centimeters. B means of driving connections (not' shown the drums are thenv `caused to rotate slowly in the direction of the arrows, the conveying screen 21 is also set in motion and `liquid ammonia or .other refrigerant is admitted into the 'interior of the drums. y As ice .crystals soaked with syrup, form on the outer surface of the drums they will be scra ed off by the scrapers 15 and accumulated in the formA of a semi-duid,` semi-solid mush on top of the scrapers, and almost liquid, mushy mass being constantly forced rearwardly by fresh accretions of the thick material until it slides through the spaces between the stems 19 into the trough and on to the screen 21. Most of the syrup which it is desired to recover' in a concentrated form will fall through the screen into the tank 7, the water being carried off by the screen in the form of snow-like ice crystalstogether with more or less soluble matter which can be recovered later by the means described in my prior patents.

I claim: l. An apparatus of the` character de- 1 scribed, comprising in combination, a tank,

a refrigerating drum in the tank, a series of radially presented Scrapers :forming an unbroken line of scraping contact with the drum, said Scrapers being cut away rearwardly to provide openings through which the mushy sherbet scraped from the drum may slide, and a screen for receiving the sherbethand permitting the liquid part of it to all through into the tank.

2. vAn apparatus -of the character described vcomprising in combination, a tank, a refrigeratlng drum in said tank, a scraper neath said Scrapers provdin Lacasse bearng against said drum, and a movable screen beneath said scraper for receiving and conveying vaway 'the sherbet scraped from the drum, while permitting the liquid pari; of it to fall throughinto the'tank.

3. An apparatus of the character described comprising incombination a tank, a pair of refrigerating drums in the tank, two series of oppositely presented `radial Scrapers bearing against said/.drumsrrespectively, an open bottomed trough besupport for the Scrapers adjacent said rums, and a traveling screen for receiving and conveying away the sherbet scraped from the drums, while permitting the liquid part of it to fall through into the tank.

4. An apparatus of the character described comprising in combination, a tank, a rotatable refrigerating drum` within the tank, and a radially presented'scraper bearing against said drum.

5. An apparatus of the character del scribed comprising in combination, a tank, a rotatable refrigerating drum within vthe tank, and a radially presented scraper yield` ably bearing against said drum.

EUDO MONTE. 

